Heated Pump/Valve Assembly; Hydrator; Pneumatic Panel - Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual

System Component Description

Heated Pump/Valve Assembly

Pump/Valve
Assembly

Hydrator

Pneumatic Panel

7-4 Omni FTIR Multi Gas CEMS Instruction Manual
Heated
The sample system heater assembly includes the ejector pump and sample
valve. This assembly also includes heated copper tubing to pre-heat
instrument air for the ejector pump, FTIR instrument zero, and sample
line flowback.
The sample gas is extracted continuously via the sample probe and the
heated line by an air driven ejector pump which is mounted inside this
assembly. The main air stream (pressurized air) has an adjustable flow
which is typically set to 6 l/min. This creates a slight under pressure which
is used to extract the sample gas from the stack.
The heated sample valve is used to allow sample air into the system from
the probe. This is a normally closed valve; in the closed state zero air is run
through a hydrator and a pre-heater and then up the sample line to the
probe, which is known as the "flowback" mode. The pre-heaters ensure
that the normally cold zero air won't cool down the sample line and FTIR
cell in this mode. When the sample valve is opened, air extracted by the
probe is delivered to the FTIR for analysis. This is the "sample" mode.
The hydrator assembly adds moisture to the sample line during flowback
mode while the FTIR instrument zero is performed. This ensures the
sample line to the probe is not stagnant and isn't dried out by the zero air
flow. This assembly is provided for future use and maintenance, but is not
currently used by the system.
The pneumatic panel
meter/regulators to control various system flows:
Ejector Pump Pressure (7.3 – 43.5 PSI)
●
CO
●
FID Combustion Air Pressure (optional, 45 PSI)
●
FTIR Purge Gas Flow (1.0 L/min)
●
FTIR Zero Air Flow (4.0 L/min)
●
Sample Line Flowback Flow (4.0 L/min)
●
Probe Zero Flow (6.0 L/min)
●
Probe Span Flow (6.0 L/min)
●
Probe Spike Flow (0.4 L/min)
●
(Figure 7–3) includes pressure regulators and flow
Free Air Pressure (22 – 29 PSI)
2
Thermo Fisher Scientific